Why would anyone want to see "Jurassic Park" in 3D when director Steven Spielberg's blockbuster 1993 movie has been available in multiple formats for two decades?
Two words: Steven Spielberg.
And you thought I was going to say: T- Rex.
Oh, T-Rex is big and frightening -- especially in 3D.
However, T-Rex wouldn't exist in "Jurassic Park" if not for Spielberg, perhaps the United States' best contemporary director who can and does direct all genres (for contrast, see "Lincoln").
"Jurassic Park" is "Jaws" of the jungle.